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Commitments, Off-Balance Sheet Risk and Contingencies (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to make loans | $ 917.4 | $ 958.7
Commitments under outstanding standby letters of credit | $ 12.4 | $ 17.3

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- Definition Commitment to make loan by company. + References No definition available. + Details
Name: | hbnc_CommitmentToMakeLoanByCompany
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments under outstanding standby letters of credit. + References No definition available. + Details
Name: | hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration